Improved beill-holdeb



.To ALL wHoM ITMAY coNcEnN;

@uiten tetes 'anni'. ffice.

'rHoMAs K. nAeom'oF 4NcmirIcH, GQNNECTIGU'T, .AssIeNonTo HIMsELF, eEonGE A; rRATT, Ai/vII IlI A1i1 T. Nontron-AND HIRAM 41s. CROSBY, ALLNor SAME rnAcE.

"' IMPRovsDiDRILL-Honnss.

' illgtrlgihnle-rrfirrri in iullgrse tlttrrs. utmf :mi mating part nf 'tige simi. l

' Be it known that I, TEOMA K. BACO, of thefcity of Norwich, the county of New Lendon,-andrStntc of* Connecticuhave invented a. new und useful Improvement in Drill-Holders; and 1' do hereby declare that` the following isla full, cleor,'and exact .description thereof, reference being'had to the accompanying drawings,

Amaking a'p'art'of this specification, and tothe letters of reference marked thereon, in which- Figure l'is a perspective Aview, showing the drill-holder complete: with the drill inserted, and ready for use.

Figure 2 showstho'severnlparts of the drillholdcr. i y A A l 'Thernatnre of my inventiou consists in the hereinafter-'described combination of devi'ccsfor holding anysized drills in the drill-holder, which is adapted for use `in lathes of fany description. l

To enable others skilled in mechanical labor to make and us5 my invention, I will proceed to describe the4 construction and'ruode ofusing and operating thc samer In the lira-wings, iig. 1, t is a washer, which' issc'rewcd or otherwise fastened upon the end'of the holder, p

having a hole in the centre, through which the shank of the drill is inserted. 'The washer also affords Va bearing for the ends of the jaws, thus securing them firmly while holdngthevdrillin. itspropecphice in theiexnetce'ntre' of the holder. The bearingof the washer upon .the ends ci' the jaws alsoi'clievcs the screw ofaportion of the strain to which it is subjected.- A

I; is the socket, through which u deep slot is cut, inwhich the jaws slidel to and from each other in opening and shutting. At the h'ottom or lower-part of' the slot, a. groove is cut in each side thereof. "This groove may A hecircular or otherwise, and the corresponding parts 'of the jaws are triade to it therein, so as to slide easily.-

Also, at the bottom part' of this slot, aber crosses at right angles with thesame, through which har the screw passes. This bar is of the sam'e width with'rthehear-ing on tlre screw, and causes the screw to work steadily in its place, and-always to shut the jaws on the centre. lhisth'earing in the har isa half circle, and rests on the .top o'l the screw.

chiepresents theatwo jaws, which open and shut `when lthe, screw, which passes thrcughithe'ir lower end is turned, The two faces of the jaws which hold the drilll are eut with parallel groovesto hold the drill securely i Vin' place, and thelowci end of. each jaw is rnade with a hnlg'e ,'wl1icl1 moy'vhe oval or of any other shape, to admit of the screw which 'passes through them being as large' as possible. 4The jaws are so arranged `with the screw as to. shut on the centre.

e isa Vscrewgiith a.' right and left thread, and Sis se made that by turning the same in one direction the jaws shell be opened, and in the 'otherv direction .theyare closed. Whether openingen-closing, they are always each equally dista-nt from a common centre One end of the screw is adapted to a wrench or screwdriven f D represents a. drill in the drill-holder, ready for use in a. lathe. Fig. 2 shows the drill-holder taken apart, soy as to exhibit it in detail, and i ,a1 is the centre hearing of the screw, Vbeing madeso as to fit i1. the circular hearing in the har at' the bottom o f the slot.

, ze' represents the-,bar fcrnied in the slot, as before vdescribed, and which gives the bearing-for thefscrew, the

circular part being that hearing. ,Y

vo and o show the face of ythe jaws, asgrooved for the purpose of holding the drill in place.

What claim asmy invention, and desireV to secure by Letters`Pat'ent,lis-

The cornhinatioil of the'jaws ci with. the washer a, the right and left threadscrew c, and thc har x', the

enmebeing constructed and operating conjointly with and-in the soeketl'b, in the maniier andA for the purpose wherein set forth. Y

THOMASIK. BACON.

. Witnesses:

u B. B. Wmrrnmone,

JOHN E. WARD. 

